Japan has started testing its fastest-ever bullet train – capable of reaching 400 kmph – as it continues to develop the revolutionary mode of travel. The ALFA-X version of the Shinkansen train began 3 years’ worth of test runs on Friday.

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Once operational, it will run at speeds of up to 360 kph (224 mph), comfortably making it the world’s fastest bullet train.

It will also outpace China’s Fuxing train, which runs at 10 kph slower despite being designed with the same top speed capabilities as the ALFA-X.

The model’s futuristic design features 10 cars and a long pointed nose.

It’ll be tested on the line between the cities of Sendai and Aomori, which are around 280 kms apart as the crow flies.

Tests will take place after midnight, when the line is quiet, and will occur twice a week.

The ALFA-X marks a new stage of growth for the Shinkansen, pushing the world-renowned high speed rail service even faster towards the future.

Its testing debut comes as Japan’s new high-speed Shinkansen N700S continues tests that began just over a year ago.

That model will enter operation in 2020, but its maximum speeds of 300 kph — the same as other N700 series trains — will be easily surpassed by the ALFA-X.

The flurry of new models coincides with Japan’s preparations to host the 2020 Summer Olympics in Tokyo.

No matter what speeds the train achieves during its test runs, it won’t match the record-breaking pace of Japan Railway’s magnetic levitation, or maglev, train which hit 603 kph (374 mph) on an experimental track in 2015.